Mac G5 hangs when attempting to print

Question

More specifically the following actions cause the Mac to hang, while showing the busy wheel.
Attempting to print from any app
Opening the Print and Fax pane from System Prefs window
Opening the Print and Fax pane from /System/Library/PreferencePanes/
I cannot switch applications nor force quit, so a hard reset is the only way to get the computer going again. It's is a Mac G5 running 10.5.5 (2Gb RAM) which prints via network using both Appletalk and Windows protocols.
Actions taken so far:
Permissions repair
Disk verification (I thought it might have been bad blocks)
Created fresh user profile (to see if it was a profile issue)
As I mainly deal with Windows PCs, I don't know where to go next. I have looked at similar threads here but my case seems to be more severe. If you want me to paste logs please give me specific instructions on where to find them as I don't know my way around Mac OS very well.
Cheers

Answer 1

I was looking for a way to reset the printing system via the CUPS web browser (http://127.0.0.1:631) but was not able to locate anything here.
So you should try an application called Print Therapy 6.x, available from;
http://www.fixamac.net/software/pt6/index.php
This is the latest version of the brilliant Printer Setup Repair utility, which was a must-have for resolving Tiger printer issues.
PaHu